Color
#631bbb
#631bbbrgb(99, 27, 187)hsl(267, 75%, 42%)oklch(0.441 0.221 295.7)Colors that go with #631bbb
Olive Green, Charcoal and Midnight Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Olive Green #808000
complementaryOlive Green sits directly opposite #631bbb on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #631bbb: softer than #000 and cool enough to feel like part of the same palette.
Midnight Blue #191970
shipped3 real palettes, including Kraken's brand system and Blue Mono put Midnight Blue beside #631bbb, as the lead colour.
Teal #008080
triadicshippedTeal completes a triad with #631bbb — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Forest Green #228b22
split-complementForest Green is a split-complement of #631bbb: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
analogousshippedRoyal Blue is #631bbb's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue Violet #8a2be2
shippedBlue Violet is paired with #631bbb in two real palettes: Twitch's brand system and Taco Bell's brand system, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #631bbb: two real palettes: Peacock's brand system and Blue Mono, as the accent.
Real palettes that use #631bbb
Tints & shades
Harmonies
Contrast
| #631bbb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.73:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.4:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #631bbb as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#631bbb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #631bbb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/631bbb-b39cc4-dfda4e-2c1f2d-e9eaf1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md